Exploited by ISIS

The terrorist group maintains an army of child soldiers, stolen from their families and indoctrinated to their cause. The children have been as young as 7.

"We have had reports of children, especially children that are mentally challenged, who have been used as suicide bombers, most probably without them even understanding what has happened or what they have to expect," Renate Winter, an expert with the UN Committee on the Rights of the Child, told CNN in 2015.

In March of last year, ISIS released a video showing a child killing a man with what appeared to be a semiautomatic handgun.

Two months earlier, an ISIS propaganda video showed a boy with a pistol apparently shooting two men in the back of the head. A photo posted in August 2014 to Twitter from an ISIS stronghold showed a 7-year-old boy holding a man's severed head.

Using children younger than 15 to participate actively in hostilities is defined as a war crime by the International Criminal Court.